Device for roughening roll surfaces



June 28, 193s.

n G. H. FRANK DEVICE FOR ROUGHENING ROLL SURFACES Filed ngc'. 11, '1955 PatenteriJuneZS,193.8 .y t t.

'UNITED STATES PATENT .oF-FICE y DEVICE Fon. ROUGHENING nou.

sURFAcEs George H. Frank, Chicago, Ill., assignor to Western Electric Company,` Incorporated, New

York, N. Y., a corporation of New York Application'neoenibcr 11, 1935, serial No. 53,941.

1 claim. (c1. so-ic) 'Ihis invention relates toa device for roughenseries of reducing passes through which the rod ing roll surfaces, and more particularly to a deto be rolled is passed in succession. One such vice for roughening the surfaces of rolling mill pass is shown at I2 (Figs. 1 and 2) and comprises rolls. cooperating peripheral grooves I3 and I 4 in the 5 In commercial rolling mills, the material is rolls'lll and Il, respectively. 4 t usually moved through the successive passes be- The rolls are usually positively driven and' the tween the reducing rolls entirely by frictional enrod or bar is seized bythe rolls at the successive gagement of the rolls with the material. In reducing passes and moved therethrough solely some instances, particularly after a rolling mill by the frictional engagement of thedepressed surhas been used for rolling rodsl or bars of bronze faces of the roll grooves with the rod. 10

or other relatively hard materials which tend to After rolling mill rolls have beenr in use for smooth the roll surfaces, the rod engaging sursometime, the surfaces of the reducing passes .faces of the rolls become so smooth that at cersometimes become so smooth that slippage octain of the passes the rolls fail to instantly bite curs between the rolls and the rod being rolled.

16 the incoming end of the rod or bar or, due to in- Consequently therolls fail -to instantly bite the 16 sufficient friction, the rolls fail to continuously incoming end ofthe rod and/or fail to continuadvance the ber after it, has entered the pass. ouslv advance the rod after it has enterede re- 'I'his is obviously objectionable and has been overducing DESS. It has been found that this OCCUIS come, heretofore, in some instances, by applying more frequently when rolling bronze or other relgritty. matter to the surfaces of the rolls or to atively hard materials lwhich tend to smooth the 20 the surfaces of the materials being rolled. This roll surfaces.

practice is not entirely satisfactory because the The present invention aieldsian inexpensive presence of the gritty matter in the iinished prodmethod 0f and means f01\ expeditiously Overuct is usually undesirable. coming the difliculties above referred to with.

vAn object of the present invention is to provide Ont interfering appreeably with the Continuons 25 an inexpensive device for roughening roll sur- Operation of the rolling mill. Thus, in aeeerdfaces. ance with this invention, when 'the roll surfaces In accordance with one embodiment of the inat any of the reducing passes become'too smooth vention; the material engaging surfaces of rollto properly bite and advance the' ineornrlarod,

$0 ing mill rolls areroughened by passing between the rod engaging surfaces of' the rolls at these 3p cooperating rolls under -pressure a roughening passes are quickly l'e-I'Ollghened Without removbar of a cross section approximating the particuing or displacing the rolls by passing therelar reducing pass and having a series of transthrough a bar'having a-hardened roughvsurface. v verse hardened teeth or ridges on one or more Preferably, the lOnghening bal' 1S 0f e CIOSS Seesurfaces thereof. tion approximating the shape of the particular 35 A more complete understanding of the invenpass the surfaces of which are to be roughened. tion will be had from the fo11owing detailed de- In Fierl 4 ofthe drawing, there is illustrated scription when read in conjunction with the aca roughening bar l5 designed t0 be used' at a re-f companying drawing, in which ducing pass such' as illustrated at I2 in Fig. l.

740 Fig. 1 is a fragmentary elevational view of a The bar I 5 is provided with a series of hardened .10

pair of rolling mill rolls showing one of the retransverse teeth or ridges I6 on opposite sides f ducing passes; V thereof. When the bar is passed between the Fig. 2 is a view similar to Fig. 1, but with the rolls as shown-in Fig. 3, the teeth l5 penetrate surfaces of the reducing pass roughened by thethe depressed surfaces of the grooves J3 and I4, c method and device of the present invention; thereby forming therein spaced apart indenta- 45 Fig. 3 is an enlarged fragmentary vertical sections -I8 (Figs. 2 and 3) which roughen the' surtloncof the cooperating rolls, with the roughening faces sufficiently to again function properly. bar shown partially passed therebetween, and It will be understood that the rough surfaces Fig.4 is a perspective view of the roughening of the roughening bar may be of any desired conbar. figuration ,and that a corresponding rough sur- Referring to the drawing, there is shown in face will be imparted thereby tothe roll surfaces. Figs. 1, 2 and 3 portions of a pair of cooperating Also, the roughening bar should be of such erossrolls I0 and H of a conventional rod rolling mill. sectional dimensions that when passed between Such rolls are usually provided with a series of the rolls, the hardened rough surfaces of the bar peripheral grooves which cooperate to form a 'wlllbe pressed against the roll surfaces with sum- 55 cient force to produce indentations in the roll surfaces. For reducing passes comprised by V- shaped peripheral grooves in the rolls, the roughening bar may have rough surfaces on all four sides so that both sides of the V-gx/{ooves are tween said rolls.

What is claimed is: A device for roughening working surfaces of straight bar`of substantially uniform cross section throughout its length adapted to be inserted and completely passed lengthwise between cooperating rolling mill rolls by the rotation of one of the rolls while said rolls are in their working positions, said bar having a hard outer surface and a relatively soft interior, and a series of transverse cutting teeth on said outer surface adapted to contact with and roughen the working surface of one of the rolls while said bar is passed be- GEORGE H.

,rolling mill 'rolls comprising a .substantially 

